Observation 143371: Boletus weberi group

When: 2013-08-18

Collection location: Franklin Parker Preserve, Woodland Twp., New Jersey, USA [Click for map]

Who: I. G. Safonov (IGSafonov)

Specimen available

This is the same mystery bolete that was found in a different area of FPP last July (Obs. 102459). This time, it was mature enough to drop spores.

The spore print looks grayish-green rather than brown under natural light.

The spores are smooth but appear (1000x, mounted in 5% KOH) like the are “stuffed with broken glass”. I don’t know if it’s an optical illusion for I don’t have any filters installed.

Obtaining an ITS sequence met with failure due to the presence of multiple hybridized regions.

Comments from Linas Kudzma:
“I Spores are typically bolete-like and non-staining in Melzer’s. The hymenium crush mount has the usual basidia, etc, but also reveals long cells whose contents stain orange in Melzer’s, but are hyaline in a 20% Glycerol mount. Very interestingly, in 20% glycerol there are groups of distinctly reddish cells in among the normal hyaline basidia and other cells. This must be the red speckling of the pore surface. I did not even notice these red cells in the Melzer’s mount because they must not have stood out as much.”

Species Lists


Unstained hymenium crush. Photo by L. Kudzma
Hymenium crush in Melzer’s. Photo by L. Kudzma
Unstained red cells in 20% glycerol. Photo by L. Kudzma

Proposed Names

-57% (1)
Recognized by sight
57% (1)
Recognized by sight: See comments under this name in obs 179586

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= Observer’s choice
= Current consensus


Add Comment
New pix + updated comments
By: I. G. Safonov (IGSafonov)
2015-02-19 17:33:28 PST (-0800)